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rpi: remove weston_plane support

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There is no need to support weston_plane anymore.
The max-planes option is removed as unused.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Pekka Paalanen 11 years ago committed by Kristian Høgsberg
parent e31e053369
commit 17bd884bff
1 changed files with 0 additions and 727 deletions
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  1. 727
      src/compositor-rpi.c

727
src/compositor-rpi.c
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@ -47,51 +47,6 @@
#include "rpi-renderer.h"
#include "evdev.h"
/*
* Dispmanx API offers alpha-blended overlays for hardware compositing.
* The final composite consists of dispmanx elements, and their contents:
* the dispmanx resource assigned to the element. The elements may be
* scanned out directly, or composited to a temporary surface, depending on
* how the firmware decides to handle the scene. Updates to multiple elements
* may be queued in a single dispmanx update object, resulting in atomic and
* vblank synchronized display updates.
*
* To avoid tearing and display artifacts, the current dispmanx resource in a
* dispmanx element must not be touched. Therefore each element must be
* double-buffered, using two resources, the front and the back. The update
* sequence is:
* 0. the front resource is already in-use, the back resource is unused
* 1. write data into the back resource
* 2. submit an element update, back becomes in-use
* 3. swap back and front pointers (both are in-use now)
* 4. wait for update_submit completion, the new back resource becomes unused
*
* A resource may be destroyed only, when the update removing the element has
* completed. Otherwise you risk showing an incomplete composition.
*
* The dispmanx element used as the native window for EGL does not need
* manually allocated resources, EGL does double-buffering internally.
* Unfortunately it also means, that we cannot alternate between two
* buffers like the DRM backend does, since we have no control over what
* resources EGL uses. We are forced to use EGL_BUFFER_PRESERVED as the
* EGL_SWAP_BEHAVIOR to avoid repainting the whole output every frame.
*
* We also cannot bundle eglSwapBuffers into our own display update, which
* means that Weston's primary plane updates and the overlay updates may
* happen unsynchronized.
*/
#ifndef ELEMENT_CHANGE_LAYER
/* copied from interface/vmcs_host/vc_vchi_dispmanx.h of userland.git */
#define ELEMENT_CHANGE_LAYER (1<<0)
#define ELEMENT_CHANGE_OPACITY (1<<1)
#define ELEMENT_CHANGE_DEST_RECT (1<<2)
#define ELEMENT_CHANGE_SRC_RECT (1<<3)
#define ELEMENT_CHANGE_MASK_RESOURCE (1<<4)
#define ELEMENT_CHANGE_TRANSFORM (1<<5)
#endif
/* Enabling this debugging incurs a significant performance hit */
#if 0
#define DBG(...) \
weston_log(__VA_ARGS__)
@ -99,40 +54,9 @@
#define DBG(...) do {} while (0)
#endif
/* If we had a fully featured vc_dispmanx_resource_write_data()... */
/*#define HAVE_RESOURCE_WRITE_DATA_RECT 1*/
struct rpi_compositor;
struct rpi_output;
struct rpi_resource {
DISPMANX_RESOURCE_HANDLE_T handle;
int width;
int height; /* height of the image (valid pixel data) */
int stride; /* bytes */
int buffer_height; /* height of the buffer */
VC_IMAGE_TYPE_T ifmt;
};
struct rpi_element {
struct wl_list link;
struct weston_plane plane;
struct rpi_output *output;
DISPMANX_ELEMENT_HANDLE_T handle;
int layer;
int need_swap;
int single_buffer;
struct rpi_resource resources[2];
struct rpi_resource *front;
struct rpi_resource *back;
pixman_region32_t prev_damage;
struct weston_surface *surface;
struct wl_listener surface_destroy_listener;
};
struct rpi_flippipe {
int readfd;
int writefd;
@ -148,9 +72,6 @@ struct rpi_output {
struct rpi_flippipe flippipe;
DISPMANX_DISPLAY_HANDLE_T display;
struct wl_list element_list; /* struct rpi_element */
struct wl_list old_element_list; /* struct rpi_element */
};
struct rpi_seat {
@ -169,7 +90,6 @@ struct rpi_compositor {
struct udev *udev;
struct tty *tty;
int max_planes; /* per output, really */
int single_buffer;
};
@ -191,425 +111,6 @@ to_rpi_compositor(struct weston_compositor *base)
return container_of(base, struct rpi_compositor, base);
}
static inline int
int_max(int a, int b)
{
return a > b ? a : b;
}
static void
rpi_resource_init(struct rpi_resource *resource)
{
resource->handle = DISPMANX_NO_HANDLE;
}
static void
rpi_resource_release(struct rpi_resource *resource)
{
if (resource->handle == DISPMANX_NO_HANDLE)
return;
vc_dispmanx_resource_delete(resource->handle);
DBG("resource %p release\n", resource);
resource->handle = DISPMANX_NO_HANDLE;
}
static int
rpi_resource_realloc(struct rpi_resource *resource, VC_IMAGE_TYPE_T ifmt,
int width, int height, int stride, int buffer_height)
{
uint32_t dummy;
if (resource->handle != DISPMANX_NO_HANDLE &&
resource->width == width &&
resource->height == height &&
resource->stride == stride &&
resource->buffer_height == buffer_height &&
resource->ifmt == ifmt)
return 0;
rpi_resource_release(resource);
/* NOTE: if stride is not a multiple of 16 pixels in bytes,
* the vc_image_* functions may break. Dispmanx elements
* should be fine, though. Buffer_height probably has similar
* constraints, too.
*/
resource->handle =
vc_dispmanx_resource_create(ifmt,
width | (stride << 16),
height | (buffer_height << 16),
&dummy);
if (resource->handle == DISPMANX_NO_HANDLE)
return -1;
resource->width = width;
resource->height = height;
resource->stride = stride;
resource->buffer_height = buffer_height;
resource->ifmt = ifmt;
DBG("resource %p alloc\n", resource);
return 0;
}
static VC_IMAGE_TYPE_T
shm_buffer_get_vc_format(struct wl_buffer *buffer)
{
switch (wl_shm_buffer_get_format(buffer)) {
case WL_SHM_FORMAT_XRGB8888:
return VC_IMAGE_XRGB8888;
case WL_SHM_FORMAT_ARGB8888:
return VC_IMAGE_ARGB8888;
default:
/* invalid format */
return VC_IMAGE_MIN;
}
}
static int
rpi_resource_update(struct rpi_resource *resource, struct wl_buffer *buffer,
pixman_region32_t *region)
{
pixman_region32_t write_region;
pixman_box32_t *r;
VC_RECT_T rect;
VC_IMAGE_TYPE_T ifmt;
uint32_t *pixels;
int width;
int height;
int stride;
int ret;
#ifdef HAVE_RESOURCE_WRITE_DATA_RECT
int n;
#endif
if (!buffer)
return -1;
ifmt = shm_buffer_get_vc_format(buffer);
width = wl_shm_buffer_get_width(buffer);
height = wl_shm_buffer_get_height(buffer);
stride = wl_shm_buffer_get_stride(buffer);
pixels = wl_shm_buffer_get_data(buffer);
if (rpi_resource_realloc(resource, ifmt, width, height,
stride, height) < 0)
return -1;
pixman_region32_init(&write_region);
pixman_region32_intersect_rect(&write_region, region,
0, 0, width, height);
#ifdef HAVE_RESOURCE_WRITE_DATA_RECT
/* XXX: Can this do a format conversion, so that scanout does not have to? */
r = pixman_region32_rectangles(&write_region, &n);
while (n--) {
vc_dispmanx_rect_set(&rect, r[n].x1, r[n].y1,
r[n].x2 - r[n].x1, r[n].y2 - r[n].y1);
ret = vc_dispmanx_resource_write_data_rect(resource->handle,
ifmt, stride,
pixels, &rect,
rect.x, rect.y);
DBG("%s: %p %ux%u@%u,%u, ret %d\n", __func__, resource,
rect.width, rect.height, rect.x, rect.y, ret);
if (ret)
break;
}
#else
/* vc_dispmanx_resource_write_data() ignores ifmt,
* rect.x, rect.width, and uses stride only for computing
* the size of the transfer as rect.height * stride.
* Therefore we can only write rows starting at x=0.
* To be able to write more than one scanline at a time,
* the resource must have been created with the same stride
* as used here, and we must write full scanlines.
*/
r = pixman_region32_extents(&write_region);
vc_dispmanx_rect_set(&rect, 0, r->y1, width, r->y2 - r->y1);
ret = vc_dispmanx_resource_write_data(resource->handle, ifmt,
stride, pixels, &rect);
DBG("%s: %p %ux%u@%u,%u, ret %d\n", __func__, resource,
width, r->y2 - r->y1, 0, r->y1, ret);
#endif
pixman_region32_fini(&write_region);
return ret ? -1 : 0;
}
static void
rpi_element_handle_surface_destroy(struct wl_listener *listener, void *data)
{
struct rpi_element *element =
container_of(listener, struct rpi_element,
surface_destroy_listener);
element->surface = NULL;
}
static struct rpi_element *
rpi_element_create(struct rpi_output *output, struct weston_surface *surface)
{
struct rpi_element *element;
element = calloc(1, sizeof *element);
if (!element)
return NULL;
element->output = output;
element->single_buffer = output->single_buffer;
element->handle = DISPMANX_NO_HANDLE;
rpi_resource_init(&element->resources[0]);
rpi_resource_init(&element->resources[1]);
element->front = &element->resources[0];
if (element->single_buffer) {
element->back = element->front;
} else {
element->back = &element->resources[1];
}
pixman_region32_init(&element->prev_damage);
weston_plane_init(&element->plane, floor(surface->geometry.x),
floor(surface->geometry.y));
element->surface = surface;
element->surface_destroy_listener.notify =
rpi_element_handle_surface_destroy;
wl_signal_add(&surface->resource.destroy_signal,
&element->surface_destroy_listener);
wl_list_insert(output->element_list.prev, &element->link);
return element;
}
static void
rpi_element_destroy(struct rpi_element *element)
{
struct weston_surface *surface = element->surface;
if (surface) {
if (surface->plane == &element->plane) {
/* If a surface, that was on a plane, gets hidden,
* it will not appear in the repaint surface list,
* is never considered in rpi_output_assign_planes(),
* and hence can stay assigned to this element's plane.
* We need to reassign it here.
*/
DBG("surface %p (%dx%d@%.1f,%.1f) to primary plane*\n",
surface,
surface->geometry.width, surface->geometry.height,
surface->geometry.x, surface->geometry.y);
weston_surface_move_to_plane(surface,
&surface->compositor->primary_plane);
}
wl_list_remove(&element->surface_destroy_listener.link);
}
wl_list_remove(&element->link);
weston_plane_release(&element->plane);
if (element->handle != DISPMANX_NO_HANDLE)
weston_log("ERROR rpi: destroying on-screen element\n");
pixman_region32_fini(&element->prev_damage);
rpi_resource_release(&element->resources[0]);
rpi_resource_release(&element->resources[1]);
DBG("element %p destroyed (%u)\n", element, element->handle);
free(element);
}
static void
rpi_element_reuse(struct rpi_element *element)
{
wl_list_remove(&element->link);
wl_list_insert(element->output->element_list.prev, &element->link);
}
static void
rpi_element_schedule_destroy(struct rpi_element *element)
{
wl_list_remove(&element->link);
wl_list_insert(element->output->old_element_list.prev,
&element->link);
}
static int
rpi_element_damage(struct rpi_element *element, struct wl_buffer *buffer,
pixman_region32_t *damage)
{
pixman_region32_t upload;
int ret;
if (!pixman_region32_not_empty(damage))
return 0;
DBG("element %p update resource %p\n", element, element->back);
if (element->single_buffer) {
ret = rpi_resource_update(element->back, buffer, damage);
} else {
pixman_region32_init(&upload);
pixman_region32_union(&upload, &element->prev_damage, damage);
ret = rpi_resource_update(element->back, buffer, &upload);
pixman_region32_fini(&upload);
}
pixman_region32_copy(&element->prev_damage, damage);
element->need_swap = 1;
return ret;
}
static void
rpi_element_compute_rects(struct rpi_element *element,
VC_RECT_T *src_rect, VC_RECT_T *dst_rect)
{
struct weston_output *output = &element->output->base;
int src_x, src_y;
int dst_x, dst_y;
int width, height;
/* assume element->plane.{x,y} == element->surface->geometry.{x,y} */
src_x = 0;
src_y = 0;
width = element->surface->geometry.width;
height = element->surface->geometry.height;
dst_x = element->plane.x - output->x;
dst_y = element->plane.y - output->y;
if (dst_x < 0) {
width += dst_x;
src_x -= dst_x;
dst_x = 0;
}
if (dst_y < 0) {
height += dst_y;
src_y -= dst_y;
dst_y = 0;
}
width = int_max(width, 0);
height = int_max(height, 0);
/* src_rect is in 16.16, dst_rect is in 32.0 unsigned fixed point */
vc_dispmanx_rect_set(src_rect, src_x << 16, src_y << 16,
width << 16, height << 16);
vc_dispmanx_rect_set(dst_rect, dst_x, dst_y, width, height);
}
static void
rpi_element_dmx_add(struct rpi_element *element,
DISPMANX_UPDATE_HANDLE_T update, int layer)
{
VC_DISPMANX_ALPHA_T alphasetup = {
DISPMANX_FLAGS_ALPHA_FROM_SOURCE | DISPMANX_FLAGS_ALPHA_PREMULT,
255, /* opacity 0-255 */
0 /* mask resource handle */
};
VC_RECT_T dst_rect;
VC_RECT_T src_rect;
rpi_element_compute_rects(element, &src_rect, &dst_rect);
element->handle = vc_dispmanx_element_add(
update,
element->output->display,
layer,
&dst_rect,
element->back->handle,
&src_rect,
DISPMANX_PROTECTION_NONE,
&alphasetup,
NULL /* clamp */,
DISPMANX_NO_ROTATE);
DBG("element %p add %u\n", element, element->handle);
}
static void
rpi_element_dmx_swap(struct rpi_element *element,
DISPMANX_UPDATE_HANDLE_T update)
{
VC_RECT_T rect;
pixman_box32_t *r;
/* XXX: skip, iff resource was not reallocated, and single-buffering */
vc_dispmanx_element_change_source(update, element->handle,
element->back->handle);
/* This is current damage now, after rpi_assign_plane() */
r = pixman_region32_extents(&element->prev_damage);
vc_dispmanx_rect_set(&rect, r->x1, r->y1,
r->x2 - r->x1, r->y2 - r->y1);
vc_dispmanx_element_modified(update, element->handle, &rect);
DBG("element %p swap\n", element);
}
static void
rpi_element_dmx_move(struct rpi_element *element,
DISPMANX_UPDATE_HANDLE_T update, int layer)
{
VC_RECT_T dst_rect;
VC_RECT_T src_rect;
/* XXX: return early, if all attributes stay the same */
rpi_element_compute_rects(element, &src_rect, &dst_rect);
vc_dispmanx_element_change_attributes(
update,
element->handle,
ELEMENT_CHANGE_LAYER |
ELEMENT_CHANGE_DEST_RECT |
ELEMENT_CHANGE_SRC_RECT,
layer,
255,
&dst_rect,
&src_rect,
DISPMANX_NO_HANDLE,
VC_IMAGE_ROT0);
DBG("element %p move\n", element);
}
static int
rpi_element_update(struct rpi_element *element,
DISPMANX_UPDATE_HANDLE_T update, int layer)
{
struct rpi_resource *tmp;
if (element->handle == DISPMANX_NO_HANDLE) {
/* need_swap is already true, see rpi_assign_plane() */
rpi_element_dmx_add(element, update, layer);
if (element->handle == DISPMANX_NO_HANDLE)
weston_log("ERROR rpi: element_add() failed.\n");
} else {
if (element->need_swap)
rpi_element_dmx_swap(element, update);
rpi_element_dmx_move(element, update, layer);
}
element->layer = layer;
if (element->need_swap) {
tmp = element->front;
element->front = element->back;
element->back = tmp;
element->need_swap = 0;
DBG("new back %p, new front %p\n",
element->back, element->front);
}
return 0;
}
static uint64_t
rpi_get_current_time(void)
{
@ -714,181 +215,6 @@ rpi_flippipe_release(struct rpi_flippipe *flippipe)
close(flippipe->writefd);
}
static struct rpi_element *
find_rpi_element_from_surface(struct weston_surface *surface)
{
struct wl_listener *listener;
struct rpi_element *element;
listener = wl_signal_get(&surface->resource.destroy_signal,
rpi_element_handle_surface_destroy);
if (!listener)
return NULL;
element = container_of(listener, struct rpi_element,
surface_destroy_listener);
if (element->surface != surface)
weston_log("ERROR rpi: sanity check failure in %s.\n",
__func__);
return element;
}
static struct rpi_element *
rpi_assign_plane(struct weston_surface *surface, struct rpi_output *output)
{
struct rpi_element *element;
/* dispmanx elements cannot transform */
if (surface->transform.enabled) {
/* XXX: inspect the transformation matrix, we might still
* be able to put it into an element; scaling, additional
* translation (window titlebar context menus?)
*/
DBG("surface %p rejected: transform\n", surface);
return NULL;
}
/* only shm surfaces supported */
if (surface->buffer_ref.buffer &&
!wl_buffer_is_shm(surface->buffer_ref.buffer)) {
DBG("surface %p rejected: not shm\n", surface);
return NULL;
}
if (surface->buffer_transform != WL_OUTPUT_TRANSFORM_NORMAL) {
DBG("surface %p rejected: unsupported buffer transform\n",
surface);
return NULL;
}
/* check if this surface previously belonged to an element */
element = find_rpi_element_from_surface(surface);
if (element) {
rpi_element_reuse(element);
element->plane.x = floor(surface->geometry.x);
element->plane.y = floor(surface->geometry.y);
DBG("surface %p reuse element %p\n", surface, element);
} else {
if (!surface->buffer_ref.buffer) {
DBG("surface %p rejected: no buffer\n", surface);
return NULL;
}
element = rpi_element_create(output, surface);
DBG("element %p created\n", element);
}
if (!element) {
DBG("surface %p rejected: no element\n", surface);
return NULL;
}
return element;
}
static void
rpi_output_assign_planes(struct weston_output *base)
{
struct rpi_output *output = to_rpi_output(base);
struct rpi_compositor *compositor = output->compositor;
struct weston_surface *surface;
pixman_region32_t overlap;
pixman_region32_t surface_overlap;
struct rpi_element *element;
int n = 0;
/* Construct the list of rpi_elements to be used into
* output->element_list, which is empty right now.
* Re-used elements are moved from old_element_list to
* element_list. */
DBG("%s\n", __func__);
pixman_region32_init(&overlap);
wl_list_for_each(surface, &compositor->base.surface_list, link) {
/* always, since all buffers are shm on rpi */
surface->keep_buffer = 1;
pixman_region32_init(&surface_overlap);
pixman_region32_intersect(&surface_overlap, &overlap,
&surface->transform.boundingbox);
element = NULL;
if (!pixman_region32_not_empty(&surface_overlap) &&
n < compositor->max_planes)
element = rpi_assign_plane(surface, output);
if (element) {
weston_surface_move_to_plane(surface, &element->plane);
DBG("surface %p (%dx%d@%.1f,%.1f) to element %p\n",
surface,
surface->geometry.width, surface->geometry.height,
surface->geometry.x, surface->geometry.y, element);
/* weston_surface_move_to_plane() does full-surface
* damage, if the plane is new, so no need to force
* initial resource update.
*/
if (rpi_element_damage(element,
surface->buffer_ref.buffer,
&surface->damage) < 0) {
rpi_element_schedule_destroy(element);
DBG("surface %p rejected: resource update failed\n",
surface);
element = NULL;
} else {
n++;
}
}
if (!element) {
weston_surface_move_to_plane(surface,
&compositor->base.primary_plane);
DBG("surface %p (%dx%d@%.1f,%.1f) to primary plane\n",
surface,
surface->geometry.width, surface->geometry.height,
surface->geometry.x, surface->geometry.y);
pixman_region32_union(&overlap, &overlap,
&surface->transform.boundingbox);
}
pixman_region32_fini(&surface_overlap);
}
pixman_region32_fini(&overlap);
}
static void
rpi_remove_elements(struct wl_list *element_list,
DISPMANX_UPDATE_HANDLE_T update)
{
struct rpi_element *element;
wl_list_for_each(element, element_list, link) {
if (element->handle == DISPMANX_NO_HANDLE)
continue;
vc_dispmanx_element_remove(update, element->handle);
DBG("element %p remove %u\n", element, element->handle);
element->handle = DISPMANX_NO_HANDLE;
}
}
static void
rpi_output_destroy_old_elements(struct rpi_output *output)
{
struct rpi_element *element, *tmp;
wl_list_for_each_safe(element, tmp, &output->old_element_list, link) {
if (element->handle != DISPMANX_NO_HANDLE)
continue;
rpi_element_destroy(element);
}
}
static void
rpi_output_start_repaint_loop(struct weston_output *output)
{
@ -904,9 +230,7 @@ rpi_output_repaint(struct weston_output *base, pixman_region32_t *damage)
struct rpi_output *output = to_rpi_output(base);
struct rpi_compositor *compositor = output->compositor;
struct weston_plane *primary_plane = &compositor->base.primary_plane;
struct rpi_element *element;
DISPMANX_UPDATE_HANDLE_T update;
int layer = 10000;
DBG("frame update start\n");
@ -915,15 +239,6 @@ rpi_output_repaint(struct weston_output *base, pixman_region32_t *damage)
*/
update = vc_dispmanx_update_start(1);
/* update all live elements */
wl_list_for_each(element, &output->element_list, link) {
if (rpi_element_update(element, update, layer--) < 0)
weston_log("ERROR rpi: element update failed.\n");
}
/* remove all unused elements */
rpi_remove_elements(&output->old_element_list, update);
rpi_renderer_set_update_handle(&output->base, update);
compositor->base.renderer->repaint_output(&output->base, damage);
@ -933,17 +248,12 @@ rpi_output_repaint(struct weston_output *base, pixman_region32_t *damage)
/* schedule callback to rpi_output_update_complete() */
rpi_dispmanx_update_submit(update, output);
DBG("frame update submitted\n");
/* Move the list of elements into the old_element_list. */
wl_list_insert_list(&output->old_element_list, &output->element_list);
wl_list_init(&output->element_list);
}
static void
rpi_output_update_complete(struct rpi_output *output, uint64_t time)
{
DBG("frame update complete(%" PRIu64 ")\n", time);
rpi_output_destroy_old_elements(output);
rpi_renderer_finish_frame(&output->base);
weston_output_finish_frame(&output->base, time);
}
@ -952,24 +262,11 @@ static void
rpi_output_destroy(struct weston_output *base)
{
struct rpi_output *output = to_rpi_output(base);
DISPMANX_UPDATE_HANDLE_T update;
struct rpi_element *element, *tmp;
DBG("%s\n", __func__);
update = vc_dispmanx_update_start(0);
rpi_remove_elements(&output->element_list, update);
rpi_remove_elements(&output->old_element_list, update);
vc_dispmanx_update_submit_sync(update);
rpi_renderer_output_destroy(base);
wl_list_for_each_safe(element, tmp, &output->element_list, link)
rpi_element_destroy(element);
wl_list_for_each_safe(element, tmp, &output->old_element_list, link)
rpi_element_destroy(element);
/* rpi_renderer_output_destroy() will schedule a removal of
* all Dispmanx Elements, and wait for the update to complete.
* Assuming updates are sequential, the wait should guarantee,
@ -1033,8 +330,6 @@ rpi_output_create(struct rpi_compositor *compositor, uint32_t transform)
output->compositor = compositor;
output->single_buffer = compositor->single_buffer;
wl_list_init(&output->element_list);
wl_list_init(&output->old_element_list);
if (rpi_flippipe_init(&output->flippipe, output) < 0) {
weston_log("Creating message pipe failed.\n");
@ -1433,7 +728,6 @@ switch_vt_binding(struct weston_seat *seat, uint32_t time, uint32_t key, void *d
struct rpi_parameters {
int tty;
int max_planes;
struct rpi_renderer_parameters renderer;
uint32_t output_transform;
};
@ -1473,11 +767,8 @@ rpi_compositor_create(struct wl_display *display, int *argc, char *argv[],
compositor->base.focus = 1;
compositor->prev_state = WESTON_COMPOSITOR_ACTIVE;
compositor->max_planes = int_max(param->max_planes, 0);
compositor->single_buffer = param->renderer.single_buffer;
weston_log("Maximum number of additional Dispmanx planes: %d\n",
compositor->max_planes);
weston_log("Dispmanx planes are %s buffered.\n",
compositor->single_buffer ? "single" : "double");
@ -1524,22 +815,6 @@ out_free:
return NULL;
}
/*
* If you have a recent enough firmware in Raspberry Pi, that
* supports falling back to off-line hardware compositing, and
* you have enabled it with dispmanx_offline=1 in /boot/config.txt,
* then VideoCore should be able to handle almost 100 Dispmanx
* elements. Therefore use 80 as the default limit.
*
* If you don't have off-line compositing support, this would be
* better as something like 10. Failing on-line compositing may
* show up as visible glitches, HDMI blanking, or invisible surfaces.
*
* When the max-planes number is reached, rpi-backend will start
* to fall back to GLESv2 compositing.
*/
#define DEFAULT_MAX_PLANES 80
WL_EXPORT struct weston_compositor *
backend_init(struct wl_display *display, int *argc, char *argv[],
int config_fd)
@ -1549,14 +824,12 @@ backend_init(struct wl_display *display, int *argc, char *argv[],
struct rpi_parameters param = {
.tty = 0, /* default to current tty */
.max_planes = DEFAULT_MAX_PLANES,
.renderer.single_buffer = 0,
.output_transform = WL_OUTPUT_TRANSFORM_NORMAL,
};
const struct weston_option rpi_options[] = {
{ WESTON_OPTION_INTEGER, "tty", 0, &param.tty },
{ WESTON_OPTION_INTEGER, "max-planes", 0, &param.max_planes },
{ WESTON_OPTION_BOOLEAN, "single-buffer", 0,
&param.renderer.single_buffer },
{ WESTON_OPTION_STRING, "transform", 0, &transform },

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